
Lee Cross is a teenage stowaway on a rocket ship, hoping to see her brother on another planet. However, her extra mass was obviously unaccounted for, leaving the ship with not enough fuel to reach its destination.
An Earthman on a solo tour of duty on one of Jupiter's moons buys a Martian woman as a companion. He mistreats her, assuming her to be just a 'dumb Martian'. He learns, to his cost, that she has more intelligence than he gives her credit for.
Psychiatrist John Frame is asked by police to examine Michael Connor, who claims to have come from another time. Frame is startled when Connor demonstrates an extraordinary and intimate knowledge of Frame's private life.